Abstract: Provided is a garnet-type solid-state electrolyte including a compound represented by Formula 1 and including a crystalline phase. The crystalline phase includes a cubic phase, and in a 7Li nuclear magnetic resonance spectrum of the solid-state electrolyte, a first peak appears at about ?2 ppm to about 8 ppm, and a full width at half maximum of the first peak is from about 0.3 ppm to about 4.0 ppm. Also provided is a method of preparing the solid-state electrolyte and a lithium battery including the solid-state electrolyte.

Abstract: A composite solid electrolyte, a method of preparing the same, and a lithium battery including the same, wherein the composite solid electrolyte includes a first solid electrolyte and a second solid electrolyte. The first solid electrolyte includes a cubic garnet phase and a pyrochlore phase and the second solid electrolyte includes lithium haloboracite. A volume of the first solid electrolyte is greater than a volume of the second solid electrolyte based on a total volume of the composite solid electrolyte and the lithium haloboracite includes chlorine, bromine, iodine, or a combination thereof.

Abstract: A composite solid-state electrolyte, a method of preparing the same, and a lithium battery including the same. The composite solid-state electrolyte includes a first solid-state electrolyte including a cubic garnet phase and a pyrochlore phase, and a second solid-state electrolyte including a glass phase, and a volume of the first solid-state electrolyte is greater than that of the second solid-state electrolyte, based on a total volume of the composite solid-state electrolyte.

Abstract: A solid-state electrolyte containing a compound represented by Formula 1: (LixM1a)(LayM2b)(ZrzM3c)O12??Formula 1 wherein in Formula 1, M1 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof, M2 is a monovalent cation, divalent cation, a trivalent cation, or a combination thereof, M3 is a monovalent cation, a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, a hexavalent cation, or a combination thereof, 6?x?8, 0?a?2, 2?y?3, 0?b?1, 0<z?2, and 0?c?2, wherein in an extended X-ray absorption fine structure spectrum of Zr in the solid-state electrolyte, a ratio of an intensity of a first peak corresponding to an interatomic distance of 1.5±0.5 angstroms and an intensity of a second peak corresponding to an interatomic distance of 3.5±0.5 angstroms is about 0.3 to about 0.75, and an ionic conductivity of the solid-state electrolyte is about 7×10?6 to about 1×10?2 Siemens per centimeter.

Abstract: An electrolyte including a compound, the compound represented by Formula 1: LiwAlxSyO4??Formula 1 wherein, in Formula 1, 2.9?w?4.7, 0.3?x?0.9, and 0.1?y?0.7, and wherein the compound is amorphous.

Abstract: A solid-state electrolyte including: a compound represented by Formula 1 Li5-4yAl1-yXyO4-4y-???Formula 1 wherein in Formula 1, 0.1?y?0.8 and 0??<1, and X is Cl, Br, or a combination thereof, and wherein the compound is amorphous.

Abstract: An organic electrolyte includes: a lithium salt, a non-aqueous solvent; and a nitrile-based compound represented by a certain formula, wherein the non-aqueous solvent includes a fluorinated cyclic carbonate compound and a fluorinated chain carbonate compound. A secondary battery including such an organic electrolyte is also disclosed.

Abstract: An electrode active material including a compound represented by Formula 1: Lix(Ni1-yMy)z(P2O7)4??<Formula 1> wherein in Formula 1, 5?x?7, 0.2?y<1, 4?z?6, and M is a Group 3 to Group 11 element or a combination thereof, but is not iron.

Abstract: A composite solid electrolyte for a secondary battery, wherein the secondary battery includes an anode, wherein the composite solid electrolyte includes a first solid electrolyte including a compound represented by Formula 1, and a second solid electrolyte including a compound represented by Formula 2, and wherein the first solid electrolyte is disposed adjacent to the anode: Li1+x+2yAlxMgyM12?x?y(PO4)3 ??Formula 1 wherein in Formula 1, M1 is germanium (Ge), zirconium (Zr), hafnium (Hf), tin (Sn), or a combination thereof, and 0<x<0.6 and 0<y<0.2, Li1+x+2yAlxMgyM22?x?y(PO4)3 ??Formula 2 wherein in Formula 2, M2 is titanium (Ti), germanium (Ge), zirconium (Zr), hafnium (Hf), tin (Sn), or a combination thereof, and 0<x<0.6 and 0?y<0.2.

Abstract: A composite cathode, including: a cathode current collector; and a cathode active material layer on the cathode current collector. The cathode active material layer includes: a crystalline phosphate solid electrolyte; a crystalline phosphate cathode active material having an electrical conductivity about 10 times to about 106 times greater than an electrical conductivity of the crystalline phosphate solid electrolyte; and an interphase between the crystalline phosphate solid electrolyte and the crystalline phosphate cathode active material.

Abstract: An electrolytic additive including a compound represented by Formula 1: wherein, in Formula 1, R1 and R2 are each independently hydrogen or a substituted or unsubstituted C1-C20 aliphatic hydrocarbon group, and at least one of R1 and R2 is a substituted or unsubstituted C2-C20 alkyl group, and R3 to R6 are each independently hydrogen, a substituted or unsubstituted C1-C20 alkyl group, or a substituted or unsubstituted C5-C20 cycloalkyl group.

Abstract: An electrolytic additive including a compound represented by Formula 1: wherein, in Formula 1, R1 and R2 are each independently hydrogen or a substituted or unsubstituted C1-C20 aliphatic hydrocarbon group, and at least one of R1 and R2 is a substituted or unsubstituted C2-C20 alkyl group, and R3 to R6 are each independently hydrogen, a substituted or unsubstituted C1-C20 alkyl group, or a substituted or unsubstituted C5-C20 cycloalkyl group.

Abstract: An air battery cathode includes a carbon composite including a core and a conductive coating layer disposed on the core, wherein the core includes a first carbon material and a second carbon material, wherein the conductive coating layer includes a metal-containing semiconductor.

Abstract: A solid electrolyte includes: an ionic liquid; a lithium salt; an inorganic particle; and a polymer, wherein an amount of the ionic liquid is greater than or equal to about 33 parts by weight, based on 100 parts by weight of the polymer. Also a lithium battery including the solid electrolyte and a method of preparing a composite electrolyte membrane including the solid electrolyte.